GOD'S WORD® Translation
I became Jewish for Jewish people. I became subject to Moses' Teachings for those who are subject to those laws. I did this to win them even though I'm not subject to Moses' Teachings.

American Standard Version
And to the Jews I became as a Jew, that I might gain Jews; to them that are under the law, as under the law, not being myself under the law, that I might gain them that are under the law;

Berean Study Bible
To the Jews I became like a Jew, to win the Jews. To those under the law I became like one under the law (though I myself am not under the law), to win those under the law.

Douay-Rheims Bible
And I became to the Jews, a Jew, that I might gain the Jews:

English Revised Version
And to the Jews I became as a Jew, that I might gain Jews; to them that are under the law, as under the law, not being myself under the law, that I might gain them that are under the law;

King James Bible
And unto the Jews I became as a Jew, that I might gain the Jews; to them that are under the law, as under the law, that I might gain them that are under the law;

World English Bible
To the Jews I became as a Jew, that I might gain Jews; to those who are under the law, as under the law, that I might gain those who are under the law;

Young's Literal Translation
and I became to the Jews as a Jew, that Jews I might gain; to those under law as under law, that those under law I might gain;

1 Corinthians 9:20 Additional Translations ...